阴水猪年(female Water-Pig)−350 or −731 or −1503— to —阳木鼠年(male Wood-Rat)−349 or −730 or −1502

Year 477 BC was a year of the pre-Julian Roman calendar. At the time, it was known as the Year of the Consulship of Pulvillus and Lanatus (or, less frequently, year 277 Ab urbe condita). The denomination 477 BC for this year has been used since the early medieval period, when the Anno Dominicalendar era became the prevalent method in Europe for naming years.

The Spartan co-ruler Leotychides and the Athenian leader Themistocles lead a fleet and army to reoccupy northern Greece and to punish the aristocratic family of the Aleuads for having aided the Persians. Leotychides is caught accepting a bribe during the operations in Thessaly.

Greek maritime cities around the Aegean Sea no longer wish to be under Spartan control and at Delos offer their allegiance, through Aristides, to Athens. They form the Delian League (also known as the Confederacy of Delos) with Cimon as their principal commander.